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US2666831A
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Method of producing tubes from strip material
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1951-10-05
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Granted: 1954-01-19
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Expires: 1971-10-05
Abstract
No abstract record available.
Inventors
- 👤 Seulen Gerhard
- 👤 Alf Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:02
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B23; B23K; B23K13/00; B23K13/01; B23K13/02; B23K13/025; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/1013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |